literal meaning: times change and stars shift
translated: everything changes over time
物
wù
thing, matter
换
huàn
trade, change
星
xīng
star
移
yí
move, shift
那英 - 雪国远方
Na Ying - Xue Guo Yuan Fang
物换星移旧事重唱
Wùhuàn-xīngyí jiùshì chóngchàng
(Though) stars shift and times change, the past sings again
This lyric is part of the original sound track (OST) in a TV show where the main character travels to a remote village of historical significance and investigates the circumstances surrounding his father's death several years prior. In this context, this saying is used to explain that while many things have changed with time, the events of the past are still of special importance in the present.
斗转星移
dǒu zhuǎn xīng yí
This idiom has the exact same meaning and can also be written as 星移斗转 (xīng yí dǒu zhuǎn). This saying literally means "the Big Dipper has turned, and the stars have moved". The full name of the constellation is 北斗星 (běi dǒu xīng, literally "northern cup-shaped stars").